fix-indents.sh

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#!/bin/bash
 
trap 'echo "Interrupted."; exit 1' INT
 
show_help() {
  echo "Usage: $(basename "$0") [--changed] [-h|--help] [FILES_OR_DIRS...]"
  echo
  echo "  --changed    Only process modified files (master or MR target branch as reference)"
  echo "  -h, --help   Show this help message"
  echo "  FILES_OR_DIRS  List of files or directories to process"
  exit 0
}
 
only_changed=false
targets=()
 
while [[ "$#" -gt 0 ]]; do
  case "$1" in
    --changed)
      only_changed=true
      ;;
    -h|--help)
      show_help
      ;;
    -*)
      echo "Unknown option: $1" >&2
      show_help
      ;;
    *)
      targets+=("$1")
      ;;
  esac
  shift
done
 
# file extensions to include
extensions=(c cpp cc h hh hpp)
 
# If --changed is given without files/dirs, use default targets
if $only_changed && [[ "${#targets[@]}" -eq 0 ]]; then
  targets=(software examples documentation benchmarks tests)
fi
 
if [[ "${#targets[@]}" -eq 0 ]]; then
  echo "Error: No files or directories specified."
  show_help
fi
 
target_branch="${CI_MERGE_REQUEST_TARGET_BRANCH_NAME:-master}"
if $only_changed; then
  echo "Checking connection to remote 'origin'..."
  if git ls-remote --exit-code --heads origin "$target_branch" &>/dev/null; then
    echo "Updating local sync of the target branch: $target_branch"
    git fetch origin "$target_branch"
  else
    echo "Warning: Could not reach remote 'origin'. Skipping fetch (offline?)."
  fi
fi
 
# Generate `find`-compatible args: ( -name "*.c" -o -name "*.cpp" ...)
find_exts_args=()
for ext in "${extensions[@]}"; do
  find_exts_args+=(-name "*.${ext}" -o)
done
unset 'find_exts_args[${#find_exts_args[@]}-1]'  # Remove trailing -o
find_exts_args=( \‍( "${find_exts_args[@]}" \‍) )
 
# Generate Bash regex: \.(c|cpp|cc|h|hh|hpp)$
bash_regex="\.($(IFS='|'; echo "${extensions[*]}"))\$"
 
modified=0
 
for target in "${targets[@]}"; do
  if [[ -d "$target" ]]; then
    echo "Scanning directory: $target"
    files=()
    if $only_changed; then
      changed_files=$( \
        (git diff --name-only "origin/$target_branch...HEAD"; \
         git diff --name-only --cached; \
         git diff --name-only) | sort -u)
      while IFS= read -r file; do
        [[ -f "$file" && "$file" == $target/* && "$file" =~ $bash_regex ]] && files+=("$file")
      done <<< "$changed_files"
    else
      while IFS= read -r line; do
        files+=("$line")
      done < <(find "$target" -type f "${find_exts_args[@]}")
    fi
  elif [[ -f "$target" && "$target" =~ $bash_regex ]]; then
    files=("$target")
  else
    echo "Skipping unsupported or non-existent target: $target"
    continue
  fi
 
  for file in "${files[@]}"; do
    echo -n "  $file: "
    output=$(emacs --batch -q --no-site-file --no-site-lisp --eval='
      (progn
        (defun indent-whole-buffer ()
          (let ((inhibit-message t))
            (indent-region (point-min) (point-max))))
        (let ((file (car command-line-args-left)))
          (find-file file)
          (normal-mode)
          (setq indent-tabs-mode nil)
          (setq tab-width 4)
          (indent-whole-buffer)
          (if (buffer-modified-p)
              (progn
                (save-buffer)
                (message "fixed"))
            (message "no changes")))
        (kill-emacs 0))
        ' "$file" 2>&1)
    echo "$output"
    if [[ "$output" == fixed ]]; then
      modified=1
    fi
  done
done
 
if [[ "$modified" -eq 1 ]]; then
  echo "One or more files were modified!"
fi
 
exit $modified